The following news is from news.gov.hk:

Renminbi to become int'l currency: Joseph Yam (http://news.gov.hk/en/category/businessandfinance/060713/html/060713en03003.htm)

任志刚指人民币金融交易趋增 (http://sc.info.gov.hk/gb/www.news.gov.hk/tc/category/businessandfinance/060713/html/060713tc03002.htm)

How does one define "international currency"?

How does one define "international currency"?
I would define this as an internationally recgonize and convert to other currencies easily.

not within this decade

when China doesn't reply on export in its economy, the obstacle is not from outside but inside. Actually it's funny if the world top 3 economy's currency is not an international currency.

I'd say sometime between 2020 - 2030

I guess around 2015

I don't see the possiblity right now.